WASHINGTON – Alexandria Ocasio-Cortez, the 29-year-old Congress freshman from New York, clapped back at longtime Democrat turned Independent Joe Lieberman after he said she wasn't the future of the party.

"New party, who dis?" Ocasio-Cortez wrote on Twitter in response to Lieberman's criticism.

Lieberman, a former vice presidential candidate who ran with Democrat Al Gore in the 2000 election, talked about Ocasio-Cortez and her progressive ideas, including up to a 70 percent tax rate on the nation's wealthiest to fund a green energy plan, in an interview on Fox Business on Thursday.

"I certainly hope she's not the future and I don't believe she is," he said, adding he thought she was too far left to be a symbol of what the Democratic party would be in the future or even when it comes to nominating a presidential candidate in 2020.

"If you look at the majority of new Democrats in the House, they tend to be, I say, center-left, if they are not left-left,” he said. “And that is because they had to be center-left to win some of those competitive swing districts that they took from Republicans."

Ocasio-Cortez has consistently fended off criticism on her social media pages, taking down critics and right-wing trolls with her responses that have included both jokes and emojis.

After a clip of Ocasio-Cortez, the youngest woman ever elected to Congress, dancing went viral last week and caught the attention of conservatives, she responded with another video of her dancing outside her new congressional office.

The video became the most retweeted tweet in just five hours for Ocasio-Cortez, who is known for her viral posts and savvy social media presence.

Ocasio-Cortez upset veteran Democrat U.S. Rep. Joe Crowley in her June primary and has become a leading voice for many progressives since, advocating for a "Green New Deal," abolishing ICE and Medicare for all.

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Alexandria Ocasio-Cortez arrives on stage to speak to her supporters during her election night party in the Queens Borough of New York on Nov. 6, 2018. 28-year-old Alexandria Ocasio-Cortez from New Yorks 14th Congressional district won Tuesdays election, defeating Republican Anthony Pappas and becomes the youngest woman elected to Congress. DON EMMERT, AFP/Getty Images

People watch the mid-term elections results while celebrating Alexandria Ocasio-Cortez congressional race big win during her election night party in the Queens Borough of New York on Nov. 6, 2018. Don Emmert, AFP/Getty Images

Alexandria Ocasio-Cortez, who is running as the Democratic nominee for New York's 14th congressional district, talks with reporters after casting her ballot in the 2018 midterm general election at a polling site in the Bronx, New York on Nov. 6, 2018. Voters across the nation are selecting who will represent them on local, state and national levels. Justin Lane, EPA-EFE

Alexandria Ocasio-Cortez, who is running as the Democratic nominee for New York's 14th congressional district, casts her ballots in the 2018 mid-term general election at a polling site in the Bronx, New York on Nov. 6, 2018. Justin Lane, EPA-EFE

New York Democratic Congressional candidate Alexandria Ocasio-Cortez embraces a supporter at a polling site after voting, Tuesday Nov. 6, 2018, in the Parkchester community in the Bronx, N.Y. Bebeto Matthews, AP

New York City congressional nominee Alexandria Ocasio-Cortez attends a tour event as part of her congressional campaign, in The Bronx, New York on Oct. 3, 2018. Ocasio-Cortez attended the event as part of her campaign's commitment to cultivate dialogue in the Bronx and Queens. Alba Vigaray, EPA-EFE

Democratic congressional candidate Alexandria Ocasio-Cortez speaks with reporters after her general campaign kick-off rally in the Bronx borough of New York on Sept. 22, 2018. Don Emmert, AFP/Getty Images

Alexandria Ocasio-Cortez, Democratic candidate running for New York's 14th Congressional district, listens to questions at a town hall event, September 19, 2018 in The Bronx borough of New York City. In a race she is widely expected to win, Ocasio-Cortez will face Republican nominee Anthony Pappas in the November 6 general election. Drew Angerer, Getty Images

Campaign workers prepare for the arrival of democratic congressional candidate Alexandria Ocasio-Cortez for her general campaign kick-off rally on Sept. 22, 2018 in the Bronx borough of New York. Don Emmert, AFP/Getty Images

Democratic congressional candidate Alexandria Ocasio-Cortez talks with supporters during her general campaign kick-off rally in the Bronx borough of New York on Sept. 22, 2018. Don Emmert, AFP/Getty Images

Democratic congressional candidate Alexandria Ocasio-Cortez talks with supporters during her general campaign kick-off rally in the Bronx borough of New York Sept. 22, 2018. Don Emmert, AFP/Getty Images

Campaign brochures about democratic congressional candidate Alexandria Ocasio-Cortez are on hand for her general campaign kick-off rally on Sept. 22, 2018 in the Bronx borough of New York. Don Emmert, AFP/Getty Images

New York City congressional nominee Alexandria Ocasio-Cortez, left, high-fives a young school boy at Public School 019 in Corona, Queens, New York on Sept. 13, 2018. Today voters are casting ballots in the New York State Democratic Primary. Peter Foley, EPA-EFE

In this June 27, 2018, photo, Alexandria Ocasio-Cortez, a winner of a Democratic Congressional primary in New York speaks to a reporter in New York. Ocasio-Cortez is back on the campaign trail, but this time in the Midwest. The 28-year-old Democratic rising star is stumping for two young, progressives hoping to win Democratic primaries in Kansas and Michigan. Mary Altaffer, AP

Alexandria Ocasio-Cortez, the winner of a Democratic Congressional primary in New York, greets a passerby in New York, Wednesday, June 27, 2018, the morning after she upset U.S. Rep. Joe Crowley in Tuesday's primary election. Mark Lennihan, AP